Do you know a good concurrency puzzles website? [closed]

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I'm learning Java concurrency and looking for interesting exercises and puzzles website (or other sources) to help me learn the API.

Thanks guys for the responses. I was more thinking that problems and exercises on a University website as part of course material for example, if you kno开发者_JAVA百科w such links that would be helpful.

BTW, I have both suggested books and yes they are a very good source.

Thank you.

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The best source of puzzles in general. http://www.javapuzzlers.com/ Some of these are about concurrency. The best book to read is JCP already mentioned.